#include <iostream>
using namespace std;
class Box {
public:
double h,w,l;
Box(double x,double y,double z){h=x;w=y;l=z;}
Box(){}
~Box(){cout << endl << "you haven't seen the last of me";}
double volume(){return (h*w*l);}
//int a = []( int b ){ int r=1; while (b>0) r*=b--; return r; }(5);
friend double mV(Box m);
};
double multiplier=5;
double mV(Box m) {
return multiplier * m.volume();
}
int main() {
Box box(5,2,3);
Box box1;
box1.h = 1;
box1.w = 1;
box1.l = 1;
cout << box.volume() << endl << box1.volume() << endl;
cout << mV(box);
}
